/Engine/Source/Runtime/Engine/Classes/Engine/PackageMapClient.h
void AsyncPackageCallback ( const [FName](API\Runtime\Core\UObject\FName) & PackageName, [UPackage](API\Runtime\CoreUObject\UObject\UPackage) * Package, [EAsyncLoadingResult::Type](API\Runtime\CoreUObject\UObject\EAsyncLoadingResult__Type) Result )